package org.apache.lucene.index;

/**
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

import java.io.IOException;

import org.apache.lucene.store.Directory;
import org.apache.lucene.util.IOUtils;

final class FormatPostingsFieldsWriter extends FormatPostingsFieldsConsumer {

    final Directory dir;
    final String segment;
    TermInfosWriter termsOut;
    final FieldInfos fieldInfos;
    FormatPostingsTermsWriter termsWriter;
    final DefaultSkipListWriter skipListWriter;
    final int totalNumDocs;

    public FormatPostingsFieldsWriter(SegmentWriteState state, FieldInfos fieldInfos) throws IOException {
        dir = state.directory;
        segment = state.segmentName;
        totalNumDocs = state.numDocs;
        this.fieldInfos = fieldInfos;
        boolean success = false;
        try {
            termsOut = new TermInfosWriter(dir, segment, fieldInfos, state.termIndexInterval);

            // TODO: this is a nasty abstraction violation (that we
            // peek down to find freqOut/proxOut) -- we need a
            // better abstraction here whereby these child consumers
            // can provide skip data or not
            skipListWriter = new DefaultSkipListWriter(termsOut.skipInterval, termsOut.maxSkipLevels, totalNumDocs, null, null);

            termsWriter = new FormatPostingsTermsWriter(state, this);
            success = true;
        } finally {
            if (!success) {
                IOUtils.closeWhileHandlingException(termsOut, termsWriter);
            }
        }
    }

    /** Add a new field */
    @Override
    FormatPostingsTermsConsumer addField(FieldInfo field) {
        termsWriter.setField(field);
        return termsWriter;
    }

    /** Called when we are done adding everything. */
    @Override
    void finish() throws IOException {
        IOUtils.close(termsOut, termsWriter);
    }
}
